Cyclopedia of architecture, carpentry, and building : a general reference work (1912)
American Technical Society · Chicago : American Technical Society · leaf 67
Theusual method is the knob and tube system, where the wires, of copper heavily insulated, are runbetween beams and studs on porcelain knobs, and in short porce-lain tubes where passing through timbers. (Fig. 35.) Although theinsurance exchanges, employ inspectors and require that every jobof… … Fig. 35. Electric Wiring. 49 42 BUILDING SUPERINTENDENCE apart to avoid any chance of contact, that they are not allowed tosag, and that the joints are properly protected by a free use of insu-lating tape. Upon brick or stone walls, and in all places wherethere is danger of injury, wires should be…
Architecture · Building
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